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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 28 |
| 4 | 585 |
| 5 | 22176 |
| 6 | 1339975 |
| 7 | 118514880 |
| 8 | 14454403425 |
| 9 | 2326680294400 |
| 10 | 478015854767451 |
| 11 | 122087424094272000 |
| 12 | 37947924636264267625 |
| 13 | 14105590169042424729600 |
| 14 | 6178966019176767549393375 |
| 15 | 3150334059785191453342744576 |
| 16 | 1849556085478041490537172810625 |
[1,1,3,28,585,22176,1339975,118514880,14454403425, 2326680294400,478015854767451,122087424094272000, 37947924636264267625,14105590169042424729600, 6178966019176767549393375, 3150334059785191453342744576, 1849556085478041490537172810625] |